When you are playing with a healer you will mostly want to give yourself battle shout and your partner comanding shout .. Well this is how you can do it :
1.When there is 10-11 sec before arena starts press comanding shout.
2.When there is 4-5 sec before arena starts press battle shout.
Now your partner should still have comanding shout and you should have battle shout.
Proof :
http://img9.imageshack.us/img9/6185/...1909183157.jpg
BTW : One friend on retail uses it and told me how to do it but since I dont have a warrior there I tested it on PTR .
Hope its not a repost.